<%@ page language="java" pageEncoding="GB2312" contentType="text/html; charset=GB2312" 
 import="java.awt.*,java.awt.image.*, javax.swing.*,com.sun.image.codec.jpeg.*,javax.imageio.*"%>
<%@ page import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" %>
<%@ page import="java.io.OutputStream" %>

<HTML>
 <HEAD>
  <TITLE> Validation </TITLE>
  <META NAME="Generator" CONTENT="EditPlus">
  <META NAME="Author" CONTENT="">
  <META NAME="Keywords" CONTENT="">
  <META NAME="Description" CONTENT="">

 </HEAD>

 <BODY>
 <%!
		Color getRandColor(int fc,int bc){
			Random random = new Random();
			if(fc>255) fc=255;
			if(bc>255) bc=255;
			int r=fc+random.nextInt(bc-fc);
			int g=fc+random.nextInt(bc-fc);
			int b=fc+random.nextInt(bc-fc);
			return new Color(r,g,b);
		}
%>
<%
	try{
		response.setHeader("Pragma","No-cache");
		response.setHeader("Cache-Control","no-cache");
		response.setDateHeader("Expires", 0);
		int width=60, height=20;
		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		OutputStream os=response.getOutputStream();
		Graphics g = image.getGraphics();
		Random random = new Random();
		g.setColor(getRandColor(200,250));
		g.fillRect(0, 0, width, height);
		
		g.setFont(new Font("Times New Roman",Font.PLAIN,18));
		g.setColor(getRandColor(160,200));
	for (int i=0;i<155;i++)
	{
		int x = random.nextInt(width);
		int y = random.nextInt(height);
		int xl = random.nextInt(12);
		int yl = random.nextInt(12);
		g.drawLine(x,y,x+xl,y+yl);
	}
		String sRand="";
		for (int i=0;i<4;i++){
		String rand=String.valueOf(random.nextInt(10));
		sRand+=rand;
		g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));
		g.drawString(rand,13*i+6,16);
	}
		session.setAttribute("rand",sRand);
		g.dispose();
		
		ImageIO.write(image, "JPEG",os);
		os.flush();
		os.close();
		os=null;
		response.flushBuffer();
		out.clear();
		out = pageContext.pushBody();
	}
	catch(IllegalStateException e)
	{
		System.out.println(e.getMessage());
		e.printStackTrace();
	}%>
  
 </BODY>
</HTML>
